#!/bin/bash
#
# zfs           This script will mount/umount the zfs filesystems.
#
# chkconfig:    2345 01 99
# description:  This script will mount/umount the zfs filesystems during
#               system boot/shutdown.  Configuration of which filesystems
#               should be mounted is handled by the zfs 'mountpoint' and
#               'canmount' properties.  See the zfs(8) man page for details.
#               It is also responsible for all userspace zfs services.
#
### BEGIN INIT INFO
# Provides: zfs
# Required-Start: $local_fs
# Required-Stop: $local_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Should-Stop:
# Short-Description: Mount/umount the zfs filesystems
# Description: ZFS is an advanced filesystem designed to simplify managing
#              and protecting your data.  This service mounts the ZFS
#              filesystems and starts all related zfs services.
### END INIT INFO

# Source function library.
. /etc/rc.d/init.d/functions

LOCKFILE=/var/lock/zfs/zfs
ZFS="/sbin/zfs"
ZPOOL="/sbin/zpool"
UDEVD="/dev/disk/by-id/"

# Source zfs configuration.
[ -r '/etc/default/zfs' ] &&  . /etc/default/zfs

[ -x "$ZPOOL" ] || exit 1
[ -x "$ZFS" ] || exit 2

start()
{
    [ -f "$LOCKFILE" ] && return 3

    # Requires selinux policy which has not been written.
    if [ -r "/selinux/enforce" ] &&
       [ "$(cat /selinux/enforce)" = "1" ]; then

        echo "SELinux ZFS policy required"
        return 4
    fi

    # Delay until all required block devices are present.
    udevadm settle

    # Load the zfs module stack
    /sbin/modprobe zfs

    # Ensure / exists in /etc/mtab, if not update mtab accordingly.
    # This should be handled by rc.sysinit but lets be paranoid.
    awk '$2 == "/" { exit 1 }' /etc/mtab
    RETVAL=$?
    if [ "$RETVAL" -eq 0 ]; then
        /bin/mount -f /
    fi

    # Import all pools, and then mount
    # all filesystem based on their properties.
    echo "Importing ZFS pools"
    "$ZPOOL" import -d "$UDEVD" -f -aN 2>/dev/null

    echo "Mounting ZFS filesystems"
    "$ZFS" mount -a

    echo "Exporting ZFS filesystems"
    "$ZFS" share -a

    mkdir -p $(dirname $LOCKFILE)
    touch "$LOCKFILE"
}

stop()
{
    [ ! -f "$LOCKFILE" ] && return 3

    echo "Unmounting ZFS filesystems"
    "$ZFS" umount -a

    rm -f "$LOCKFILE"
}

status()
{
    [ ! -f "$LOCKFILE" ] && return 3

    "$ZPOOL" status && echo "" && "$ZPOOL" list
}

case "$1" in
    start)
        start
        RETVAL=$?
        ;;
    stop)
        stop
        RETVAL=$?
        ;;
    status)
        status
        RETVAL=$?
        ;;
    restart)
        stop
        start
        ;;
    condrestart)
        if [ -f "$LOCKFILE" ]; then
            stop
            start
        fi
        ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|condrestart}"
        ;;
esac

exit $RETVAL

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